it's like murphy's law. >> in this case, an expansion tank. in others insulation problems and in this world, issues with a four-stair heating system. >> you wait until it breaks, then, you call. then make sense of mind bending explanations. >> you replace the board. >> when parts work hard yes, stuff goes wrong. >> then, when you get a heat wave, what happens? >> air conditioning goes up. >> >>> and a power outage sent some residents into a deep freeze. power restored to all but a few dozen folks at this point. but 4100 customers lost electricity this morning including three skoochls they had to move students to sunniest and warmest classrooms. >> it's probably about 25 degrees in there. because i know it's about just shy of 30 here. and in there, it's colder. this is a cement. >> also calling a financial hardship for businesses like huckel berry's cafe. >> this is painful. yes. friday is a big day. so this is painful. and our hours are only 7:00 to 3:00. it's going to be a bad day for us. >> tough break. pg&e says it's caused by failure of an